Piston-push-rod holder



P. MALTRY AND W. T. HECKLER."

PISTON PUSH ROD HOLDER.

APPLICATION FILED Nov. 21, l9l8.

1,328,092, Patented Jan. 13, 1920'.

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PETER MALTRY AND WINFIELD T. HECKLER, OF BLUE ISLAND, ILLINOIS PISTON-PUSI-I-ROD HOLDER.

Specification of Letters Patent. Patented Jan, 13, 1921).

Application filed November 27, 1918. Serial No. 264,428.

To all whom it may concern:

Be it known that we, PETER MALTRY and WINFIELD T. HECKLER, citizens of the United States, residing at Blue Island, in the county 7 of Cook and State of Illinois, have invented certain new and useful Improvements in Piston-Push-Rod Holders, of which the following is a specification.

Our invention relates to fluid pressure brakes and particularly to a novel piston push rod holder.

In the operation of air brakes, and particularly driven brakes, a connector is provided to connect the brake lever to the end of the piston push rod for operation of the brakes. In practice this is generally called the piston push rod holder. One of the obj ections to the present form of connector is that after a short while in use the parts become worn and play results, therefore defeating the maximum efiicient operation of the brake system. Furthermore, when the push rod holder in the present type has been deformed "under use, it is impossible to replace the same as the threads on either the rod or holder or both have been worn off. Such an arrangement requires that a new piston rod as well as a new piston rod holder must be inserted in the device to make the same operative.

The object of our invention is to improve piston push rod holders for general commercial use.

Generally speaking we accomplish the purposes of our invention by providing a.

two-part holder, the parts being substantially semicircular in shape and forming on each part an abutment which serves as a shoulder to rest against the end of the piston rod. Means are provided to fasten the two parts together in immovable clamping engagement on the rod, and ears are also present with which the brake lever is operatively connected.

Our invention will be more readily under stood by reference to the drawings wherein- Figure 1 shows a top plan view of the embodiment of our invention,

Fig. 2 is a side elevation of the arrangement of Fig. 1,

Fig. 3 is an end elevation of the holder as seen from the right hand side of Fig. 2,

Fig. 1 is an elevational view of one of the members, and

Fig. 5 is a section on line 55 of Fig. 2.

In the drawings, 10 represents a piston for movement in the usual brake cylinder (not shown). Connected thereto at one end is the piston push rod 11 having at its otherend the push rod holder embodying our invention. The thrust transmitting connector or holder is essentially a socket member adapted to receive the end of the push piston and having its socket 14L terminated by an abut ment 15 forming a shoulder 16 against which the rod seats as shown in Figs. 1 and 2 and through which thrust is transmitted to the brake lever. The connector is divided diametrically so that it comprises two portions '12 and 13 approximately semicircular in elevation. The portions 12 and 13are provided with ears 17 having apertures 18 which receive the pintle that pivotally unites the connector with the brake lever. Also, the members l2 and 13 are provided with clamping ears 19, 20, whereby the two members may be fastened together, as by bolts and nuts 21.

In such an arrangement it is desirable th'at relative rotative movement between the holder and the piston rod be prevented. To accomplish this end we form in the end of the pistonrod apertures 22 and on the members l2 and 13, keying-lugs 23, which, when the parts are assembled, project into the apertures 22. The plane of separation of the members 12, 13, is intermediate of the pintle-ears 17, as well as of the clamping cars 19, 20; and the anti-rotation lugs 22, 23 are preferably in alinement with the pintle ears so thatthe clamping action of the bolts is in the direction to resist separation of the pintle-ears and press the lugs-22, 23 into engagement with the push rod. To assemble the holder of our invention the parts 12 and 13 are brought together around the end of the piston rod 11 with the lugs 23 extending into the apertures 22 and then the bolts 21 are tightened so that a firm clampingengagement is made. The parts are arranged with the shoulder 16 in abutment with the end of the rod so that brake-applytive parts as herein arranged. It will be observed that relative movement between the holder and the rod is prevented, therefore, at all times permitting proper actuation of the brake rod by means of the piston. Furthermore, it is possible to apply the holder of our invention to the ends of piston rods which have been threaded as it is desirable at times to renew the push rod holders on such pistons. The only thing necessary to be, done in this instance is to provide the apertures 2-2 in the threaded end of the piston rod 11 and apply the holders as above directed.

Referring to Fig. 5, it will be noted that the socket is formed oblate so that the interior surfaces of the members 12 and 13 are slightly eccentric with respect to the cylindrical surface of the piston rod. This is for the purpose of developing light clamping engagement of the socket members with the push rod, to localize this engagement where the keying lugs enter the rod and insure seat ing of the end of the rod upon at least that portion of the shoulder 16 which is in alinement with the pintle ears 17.

We are aware that the device is susceptible of modifications and such modifications. as come within the scope of the appended claims we consider as coming within our invention.

We claim 1. In an air brake, the combination of a piston, a push rod, and a thrust transmitting connector for said rod; said connector having a socket which receives the rod and termi-- nates in a shoulder against which the end of the rod seats, and having ears adapted to receive the pintle of a brake lever; said connector being divided diametrically in a plane intermediate of its pintle ears into two separable members and provided with clamping bolts for drawing together said members in the direction to resist separation of the ears; said push rod and socket members having registering recesses and key-lugs located in alinement with the pintle ears and pressed into inter-engagement by the clamping action of the bolts.

2. In an air brake, the combination of a piston, a push rod, and a thrust transmitting connector for said rod; said connector having a socket which receives the rod and terminates in a shoulder against which the end of the rod seats, and having ears adapted to receive the pintle of a brake lever; said connector being divided diametrically in a plane intermediate of its pintle ears into two separable members and provided with clamping bolts for drawing together said members in the direction toresist separation of the ears; said members having key-lugs on their inner faces in longitudinal alinement with the pintle ears and in position to be pressed into engagement with the push rod by the clamping action of the bolts, and said socket being oblate with its shorter diameter coincident with said anchoring lugs.

Signed at Blue Island, Illinois, this 21st day of November, A. D. 1918.

PETER MALTRY. WINFIELD T. HEOKLER. 

